Fastener



FIG. 1 is a perspective view of a fastener showing the new design.

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a side view in an inverted position of the opposite side;

FIG. 5 is a side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design, as shown and described, for a fastener. 